摘要
设计了一种具有直流侧电压平衡功能的光伏并网系统,系统采用级联型多电平逆变器,当功率单元直流侧电压不平衡时,通过对占空比进行微调实现电压平衡控制,从而改善输出波形,提高电能质量;且控制器引入电网电压前馈,以消除电网电压畸变或扰动对逆变器输出造成的影响,更好地满足了光伏发电并网的特殊要求。理论分析和仿真结果验证了该系统的正确性和实用性。
A kind of grid-connected photovoltaic system with voltage-balanced function at DC side was designed. The system adopted cascaded multilevel inverter, and when the voltage of power unit at DC side was not balanced, the system adjusted the duty in some sort to realize voltage-balanced control, thus to improve output waves and to raise electric energy quality. The controller introduced grid voltage feed-forward and eliminated impacts of grid voltage distortion or disturbance on inverter output. The design meets the special requirements of grid-connected photovoltaic system. The theoretical analysis and simulation results have verified correctness and practical property of the system.
出处
《电工电气》
2012年第11期11-14,共4页
Electrotechnics Electric
关键词
光伏并网系统
级联H桥
电压平衡控制
载波移相
grid-connected photovoltaic system
cascaded H-bridge
voltage-balanced control
carrier phase shift
作者简介
晏阳（1988-），男，硕士研究生，研究方向为新能源发电并网技术。
